Phillies team physician Michael Ciccotti says some kids begin specializing in one sport when they are only 4 years old.

"Just playing a sport, the same sport, the entire year, their bodies are not capable of withstanding it," he explained.

Ciccotti added that for most kids, sports will not become a profession -- and parents and coaches should keep that in mind. He said he is often reminded of this when he examines a young player, and there's a lot of emotion in the room.